Have you tested the waters with a request for the devs to remove whatever you consider suspicious in that list?
I believe the current issue regarding Firefox is it's new terms of use, which are not presently in Zen browser. Other than that is a pretty close copy of Firefox, which is the point, and why I suggested it to parent as an option.
I did not. However considering that they have advertised themselves as "privacy-focused" Firefox alternative and can't be bothered to do the most superficial of tests, I don't think they care or are competent[1] enough to change it.
If you want an actual private Firefox alternative there are already multiple long standing and competent projects such as arkenfox, librewolf, mullvad and tor browser.
The website looks good, but as I scroll down in mobile Safari the page starts glitching until it fully crashes and Safari says an error repeatedly occurred. It doesn’t inspire much confidence when the web page for a web browser is broken.
It's relatively new, but I liked using it more than other of the forks.